If you want to expand on some of the facts presented in my answer please leave a comment on the answer.
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Eduard FlorinescuDec 5 '12 at 21:45

@eduard, thanks for that very thurrer, just one question can you set it so someone with delegate access is able to view emails but NOT send, edit, delete them.. (when using gmail in the browser)
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samDec 5 '12 at 22:18

Where are those mentioned restrictions? The doc maybe updated, I can't find it. Do you mean because the user cannot connect with his own password to the other's account that it will not work?
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user56499Jan 7 '14 at 15:56